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Octocorallia: Gorgoniidae) from Ecuador, with a Description of a New Species

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Octocorallia: Gorgoniidae) from Ecuador, with a Description of a New Species SCIENTIA MARINA 80(3) September 2016, 000-000, Barcelona (Spain) ISSN-L: 0214-8358 doi: http://dx.doi.org/10.3989/scimar.04392.14A New records of the genera Leptogorgia, Pacifigorgia and Eugorgia (Octocorallia: Gorgoniidae) from Ecuador, with a description of a new species María del Mar Soler-Hurtado 1,2, Annie Machordom 1, Jesús Muñoz 3,4, Pablo J. López-González 2 1 Dpto. Biodiversidad y Biología Evolutiva. Museo Nacional de Ciencias Naturales (MNCN-CSIC), 28006 Madrid, Spain. E-mail: [email protected]; [email protected] 2 Biodiversidad y Ecología de Invertebrados Marinos, Facultad de Biología, Universidad de Sevilla, 41012, Sevilla, Spain. E-mail: [email protected] 3 Real Jardín Botánico (CSIC), Plaza de Murillo 2, 28014 Madrid, Spain. E-mail: [email protected] 4 Centro de Biodiversidad y Cambio Climático, Universidad Tecnológica Indoamérica, Quito, Ecuador. Summary: New records of the genera Leptogorgia, Pacifigorgia and Eugorgia (Octocorallia: Gorgoniidae) on the coast of Ecuador are reported. These new records redefine the current known limit of distribution of these species on the eastern Pacific coast (from southern California to Chile). Some of these species are reported for the first time since their original description. The newly collected specimens allow for the measurement of the variability of several morphological characters, from colonial to sclerite levels. Additionally, Pacifigorgia machalilla n. sp. is described and compared with its closest rela- tives. Morphological differentiation among related species is supported by genetic divergence estimated from an extended barcode of MutS + Igr + COI. Keywords: Gorgoniidae; eastern Pacific; distribution; mtMutS; COI; barcode; Igr. Nuevos registros de los géneros Leptogorgia, Pacifigorgia y Eugorgia (Octocorallia: Gorgoniidae) en Ecuador, con la descripción de una especie nueva Resumen: Se han obtenido nuevos registros para los géneros Leptogorgia, Pacifigorgia y Eugorgia (Octocorallia: Gorgo- niidae) en la costa de Ecuador. Estos nuevos registros redefinen el límite actual conocido en la distribución de estas especies en la costa del Pacífico Oriental (desde el sur de California hasta Chile). Algunas de estas especies han sido registradas por primera vez desde su descripción original. Las nuevas muestras recogidas permiten medir la variabilidad de los caracteres morfológicos, desde el nivel de colonia hasta el de esclerito. Además, se describe la especie Pacifigorgia machalilla n. sp., y se compara con sus congéneres más relacionados. Las diferenciaciones morfológicas encontradas entre estas especies, están apoyadas por la divergencia genética estimada a partir del “código de barras” ampliado, formado por los genes MutS + Igr + COI. Palabras clave: Gorgoniidae; este del Pacífico; distribución; mtMutS; COI; “código de barras”; Igr. Citation/Como citar este artículo: Soler-Hurtado M.M., Machordom A., Muñoz J., López-González P.J. 2016. New re- cords of the genera Leptogorgia, Pacifigorgia and Eugorgia (Octocorallia: Gorgoniidae) from Ecuador, with a description of a new species. Sci. Mar. 80(3): 000-000. doi: http://dx.doi.org/10.3989/scimar.04392.14A LSID: urn:lsid:zoobank.org:pub:A6373513-5FFE-4D2E-B130-98C239C0EDF3 Editor: X. Turon. Received: December 18, 2015. Accepted: June 1, 2016. Published:September 25, 2016. Copyright: © 2016 CSIC. This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-by) Spain 3.0 License. INTRODUCTION gorgonian octocorals are one of the best-represented taxonomic groups in sublittoral marine ecosystems, The octocorals are found in marine habitats rang- are ecologically important and are the dominant mac- ing from intertidal to abyssal waters and are distributed rofaunal group on many tropical reefs (Sánchez et al. from the Arctic to the Antarctic (Bayer 1961). The 2003, Williams and Breedy 2004). The study of the 2 • M.M. Soler-Hurtado et al. eastern Pacific gorgonian octocorals, specifically in Ecuador, has not matched the intensity and number of publications dedicated to Caribbean species (see Bayer 1981). Despite important contributions by authors such as Breedy and Guzmán (2002, 2007), Williams and Breedy (2004) and Breedy et al. (2009) in the east- ern Pacific, the knowledge on the gorgonian fauna of Ecuador is far from complete (but see Bielschowsky 1929 and Soler-Hurtado and López-González 2012). Four gorgoniid genera (Gorgoniidae) were previously reported in the eastern Pacific, Phycogorgia Milne-Ed- wards and Haime, 1850, Leptogorgia Milne-Edwards and Haime, 1857, Eugorgia Verrill, 1868 and Paci- figorgia Bayer, 1951. The genus Leptogorgia, with about 60 valid species (27 species in the eastern Pa- cific) is one of the most frequent genera in the shallow Fig. 1. – Station map in Ecuadorian waters where gorgonians octoc- water communities of the eastern Pacific (Breedy and orals were sampled from February 2010 to June 2014. Guzmán 2007), with a wide distribution from southern California to Chile. This genus is also present in the took colour photographs of the living specimens in Caribbean, western and eastern South African coasts, their environment; specimens were also photographed the eastern Atlantic and the Mediterranean Sea, and one outside the water, just after collection to ensure the species is known from the sub-Antarctic (Williams and accuracy of our colour descriptions. Subsamples were Lindo 1997). The genus Pacifigorgia is geographically fixed in either absolute ethanol for further molecular confined to the Pacific coast of tropical America, with analyses, or in 4% buffered formalin (after previous the exception of Pacifigorgia elegans (Milne-Edwards relaxation with menthol crystals for a few hours) for and Haime, 1857) from the tropical western Atlantic. the morphological study; the rest of the colonies were Pacifigorgia includes about 36 recognized species dis- allowed to air dry. Buffered formalin-fixed subsamples tributed throughout the eastern tropical Pacific region were subsequently transferred to 70% ethanol (Soler- (Breedy and Guzmán 2002, 2003, 2004, Williams and Hurtado and López-González 2012). Breedy 2004, Guzmán and Breedy 2011). The genus Eugorgia, which includes 16 species, is considered ex- External morphology and SEM study clusive to the eastern Pacific (from southern California to Peru) (Breedy and Guzmán 2013). Finally, the ge- Fragments from different parts of the colony were nus Phycogorgia, with only one species, Phycogorgia prepared for study by SEM according to standard fucata (Valenciennes, 1846), is distributed along the methods (Bayer and Stefani 1989, Alderslade 1998). west coast of Central and South America (Bayer 1953). Additionally, permanent mounts were made for light The aim of this report is to present new informa- microscopy observation. The colonies are described tion derived from material of the genera Eugorgia, and illustrated according to standard terminology Leptogorgia and Pacifigorgia collected in Ecuador. (Bayer et al. 1983, Breedy and Guzmán 2003, 2007). We expand the known distribution of some species in For either morphological and molecular compari- the eastern Pacific and describe new morphological sons, we studied types and additional materials depos- variability for several taxa. Finally, using morphologi- ited in the Museum of Comparative Zoology, Harvard cal and genetic data, we describe one new species of University (MCZ); Muséum National d’Histoire Na- Pacifigorgia, emphasizing the set of morphological turelle, Paris (MNHN); the Natural History Museum, characters considered to be of taxonomic importance London (NHM); the Yale Peabody Museum of Natural for this genus (Breedy and Guzmán 2002, 2003, 2004, History, New Haven (YPM); and the National Museum Williams and Breedy 2004, Guzmán and Breedy of Natural History, Smithsonian, Washington (MNH). 2011). We include the sequence analysis of the barcode Museum specimens were revised for morphological of mtMutS plus COI with a short, adjacent intergenic comparative purposes and, in some cases, for molecular region (Igr1) proposed by McFadden et al. (2011), analysis. These samples are listed in the text after the with its closest congeners and available sequences in newly collected material of each species. Additional GenBank. museum specimens of species revised but not found in Ecuador were the following: MATERIALS AND METHODS Eugorgia ampla (Verrill, 1864): NHM 69.4.15.53, Baja California (Mexico), no further data. YPM 399, Study area and sampling methodology Baja California, 11-15 m depth, 1865. MCZ 65167, Mexico, no depth given, date unknown. Eleven stations in Ecuadorian waters were sampled Eugorgia aurantica (Horn, 1860): YPM (4051), from February 2010 to June 2014 (Fig. 1). Gorgonians Baja California (Mexico), no depth given, 1867-1870. were collected by SCUBA diving in a depth range of NHM 40.8.22.8, Baja California (Mexico), no depth between 5 and 30 m. Substrata in these habitats mainly given, date unknown. MCZ 36185, Baja California include sand and rocky bottoms. During sampling, we (Mexico), no depth given, date unknown. SCI. MAR. 80(3), September 2016, 000-000. ISSN-L 0214-8358 doi: http://dx.doi.org/10.3989/scimar.04392.14A Gorgoniidae from Ecuador • 3 Table 1. – Pacifigorgia species involved in the molecular comparisons carried out in this paper. Materials in bold are species sequenced for this study. Note that all GenBank sequences are considered here with the names as they appear in GenBank and their original publications (including numbers or letters).
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